What causes the appearance of lines in a emission spectrum

If an engine operates on an input temperature of 800k and an exhaust temperature of 600k, calculate the efficiency of the engine.

A person runs at a speed of 4 meters per second. How far will the person travel in 40 seconds?

Why a tractor's big tyres stop it sinking too far into soft soil?

A city bus travels along its route from Jackson Street 8 km to Aurora Avenue, where it turns and continues 13 km. What is the total distance that the bus has traveled? km

Use the HR diagram below to answer the question. Labeled HR diagram. The main sequence slopes from the upper-left of the diagram, which is blue, to the bottom-left of the diagram, which is red-orange.

What changes would a cold front bring to an area with warm, dry weather? extended period of rain or snow several days of gray skies dry air and sunny skies rain or thunderstorms

Candace is a confident, disciplined, motivated, hardworking team player. She pushes her teammates to perform to their full potential but guides them and does not control them. What does Candace's commitment to her team show?

Windows that look into bathrooms are often translucent instead of transparent. Why?

Which of the following does culture contribute to the preferences and behaviors of consumers?

Anna bought a tangle fish and two rainbow fish for her aquarium the rainbow fish cost $6 more than the angelfish if she paid a total of $37 what is the cost of the angel fish